These Sisters Showed Off Their Amazing Harmonies For A Spot On 'The Voice'

They turned all four chairs.

Take note of new music and the best live performances here: aplus.com
Take note of new music and the best live performances here: aplus.com

The Voice coaches weren't expecting to hear two voices when sister duo Whitney & Shannon started their blind audition, but once they got a taste of the pair's amazing harmonies, they were sold. By the end of their performance of "Landslide," all four chairs had spun around.

Whitney, 25, and Shannon, 23, apparently hadn't sung together in some time, but you'd never know it. "At first I was like, that's that most talented person ever," Adam Levine joked about hearing both sisters' voices. He added, "Hearing how beautifully you guys were harmonizing, you can't teach something like that."

Upon learning that the women were performing the Dixie Chicks' version of the classic song (originally by Fleetwood Mac), Blake Shelton made the case for his team. "It's that thing that you can only have, I truly believe, with siblings." He mentioned the Swon brothers, a duo he previously coached on the show.

Ultimately, however, the sisters were most convinced by Alicia Keys' pitch: "There is no box for you of where you're gonna fit in. You're everywhere, and that's how I see you, and I'd love to help you get everywhere. ... So let's bust down those stereotypes and break down those walls together, forging through major sisterhood."

Monday night marked the final set of blind auditions, and by the end of the episode, all four coaches had full teams.

Watch Whitney & Shannon blow the coaches away in the video below: